Hoisting attachment for tubular steel scaffolds



. Filed June 22. 1953 June 9, 1959 c. E. McDANlEL ET AL 2,890,082

HOISTING ATTACHMENT FOR TUBULAR STEEL SCAFFOLDS 5 Sheets-Sheet 1 INVENTORS CAZT'EQ, E Akfiwv/A-z JOHN TKAra/ws-Y Boat-e7- ,4. zme/v'v June 9, 1959 C. E. M DANIEL ET AL HDISI'ING ATTACHMENT FOR TUBULAR STEEL SCAFFOLDS Filed June 22. 1953 3 Sheets-Sheet 2 \1 :FIIEF 5 INVENTORS Caz-r52 E McDA/WEL JoH/v 7. ZAE/V' 208527 A. lane/v5) United States HOISTING ATTACHMENT FOR TUBULAR STEEL SCAFFOLDS Carter E. McDaniel, John T. Karney, and Robert A. Karney, Memphis, Tenn.

Application June 22,1953, Serial No. 363,113

6 Claims. (Cl. 304-29) This invention relates to an attachment for a tubular steel scaffold, wherein it is desired to provide a simple and inexpensive means of lifting various building materials using the tubular steel scaffold as a frame work for the hoisting attachment.

Various types of hoists are readily available for use in the erection of buildings. These primarily are of two types. The first would be where the hoist and tower or supporting framework are one complete unit. They are large heavy duty type hoists lacking in mobility and incapable of being erected or disassembled with any amount of time or trouble. The second type is when the hoist and tower or framework are of component pieces. Here again the mechanics of assembling this type of lift would preclude the advantages of using any lift at all.

It is the purpose of this invention to provide an extremely inexpensive attachment for tubular steel scaffolds which would serve for lifting light loads up to more convenient working heights. Since steel scaffolds can be fitted with casters the adaptation of this attachment would provide for a mobile lift either inside the building for the attachment of various devices to the ceiling and walls of the building or outside for the supply of building materials to work scaffolds along the perimeters of the building. a

It is a feature of this invention that it will be of the unit type construction in that extensions may be added or subtracted to the basic unit to increase or decrease the height of lifting.

It is a further feature of this invention that the method of clamping the hoisting attachment to the tubular steel scaffold will permit it to be adapted to any available tubular supporting structure of similar nature.

It is an object of this invention to allow the tubular steel scaffold to form the supporting frame Work for the lift. This we accomplish by using a single vertical guide at each end of the lifting platform clamped to the tubular steel scaffold and on which are mounted at the top and bottom guide pulleys for the lift platform cables. Q

The hoisting drum, ratchet and friction brake assembly are clamped to the outside of the tubular steel scaffold.

These and other objects and novel features of this invention will be more clearly and fully set forth in the following specification and claims:

In the drawings forming a part of our specification:

Figure 1 is a diagrammatic side elevation of a conventional tubular steel scaffold showing the application of the hoisting attachment.

Figure 2 is a detail cross section of the vertical slide assembly taken on the line 22 of Figure 1.

Figure 3 is a top plan view of the tubular steel scaffold with the lift platform and hoisting unit in place.

Figure 4 is an enlarged detailed elevation of clamp and coupling devices used.

Figure 5 is a detail cross section of the clamp and coupling device taken on the line 55 of Figure 4.

Figure 6 is a detailed cross section of the tubular steel scaffold taken on the line 66 of Figure 1.

Figure 7 is an enlarged detailed elevation of the lower cable guide pulley and spreader bar coupling device.

Figure 8 is a detail cross section of the lower cable guide pulley taken on the line 8-8 of Figure 7.

Our invention comprises in general of three separate pieces; the vertical guide rods consisting of the upper guide rods 1 and the lower guide rods 10, the lift platform 2 and vertical slide assemblies 3 and the hoisting unit 4. The vertical guide rods are made in sections the top section 1 having an upper cable guide pulley 5 and lower section 10 is fitted with the lower cable guide pulleys 6 mounted in an assembly 11 for connecting the spreader bar 7 to the two lower cable guide assemblies 11. The method of coupling the upper guide rods 1 to the lower guide rods 10 is best illustrated in Figure 4 and Figure 5. Figure 4 shows an enlarged elevation of the upper guide rods 1 coupled to the lower guide rods 10 by means of the coupling pin 13. The coupling pin 13 consists of two pieces of pipe, the inter pin 14 and the outer sleeve 15. The outside diameter of the inter pin 14 and the inside diameter of the outer sleeve 15 are of such ratio that they are a snug fit together.

The lower guide rods 10 are prevented from turning by the clamping device 8 which is shown in Figure 4 and Figure 5. The clamping device 8 consists of a short piece of bar stock 9 fastened to the backing plate 16, on the backing plate 16 is mounted the sleeve 17 and in the sleeve 17 is the hinged clamp bolt 18. The backing plate 16 is slotted 19 to receive the two ends of the hinged clamp bolt 18 in the locked position. The two winged nuts 20 and washers 21 may be removed from the ends of the hinged clamp bolt 18 allowing the hinged clamp bolt 18 to swing from the slot 19 to the retracted position freeing the lower guide rod 10 from the rail 22 of the tubular steel scafiold.

The upper guide rods 1 are prevented from turning by the application of the same clamping device 8 as described for the lower guide rods 10 in the preceding paragraph.

The lower guide rods 10 are fitted with an assembly 11 as shown in Figure 7 and Figure 8 which consists of the lower cable guide pulley 6 at the outside end between two spaced angles 23, the lower guide rods 10 and the spreader bar coupling device 24. The spreader bar coupling device 24 consists of two pieces of pipe. The outside or sleeve 25 is the same diameter as the spreader bar 7. The spreader bar 7 has at each end a short vertical section 27 to engage the pin 29. The outside diameter of the pin 29 is of such ratio to the inside diameters of the sleeve 25 and the short vertical section 27 as to be a snug fit to the sleeve 25 and a sliding fit to the short vertical section 27. The assembly of the spreader bar 7 to the spreader bar coupling device 24 prevents the strain of the hoisting cable 26 from warping inward the lower section 28 of the tubular steel scaffold.

The lift platform 2 consists of a laminated wood deck 30 supported by a pipe frame work. The pipe frame work consists of one length of pipe 31 with six outrigger pieces of pipe 32 braced into a lower piece of pipe 33 with short bars 34 transversely and long bars 35 longitudinally. To each end of the lift platform 2 is affixed the vertical slide assemblies 3. The vertical slide assemblies 3 consists of two angles 36 spaced apart for a sliding fit on the vertical guide rods 1 and 10 and securely fastened to the lift platform outrigger pipes 32 by the plates 37. At the top end of the angles 36 is a short angle 38 for spacing apart the top of the angles 36 and also for the mounting of the eye bolt 39. The hoisting cable 26 is connected to the eye bolt 39 and threaded over the 3, upper cable guide pulleys to form'the lifting means for the lift platform 2.

The hoisting unit 4 is of "the single drum type with a cable spacer 41 to rqv'iae; twdse'ctions and prevent the hoisting cables froni' t wlsting together, The hand crank 42' operates a gear 43 witha forty to on'e' ratio with the gear 44 on-the'hoisting drum" 4S. provides a suitable means of hoisting the lift platform 2 T he friction rake 46 on' theother endbf the hoisting 45 rovides for the safe, slow lowering of the lift platform 2 and the; dog 47 pe mits he" gear 43 to be locxed n1 position, holding the lift latrennat any desired height,

From the foregoing it will be' obvious that the applicatier; of our hoisting attachment to any ty e of tubular steel scaffold will provide a means of lifting light loads such as would be necessar in th erection of buildings. Tests havesh'own that ourinveritio'n could be affixed to any type of tubular steel scaffold with a minimum amount of time and effort. Also 'tliat'the addition or subtraction of vertical guide rods would provide a lift platform at the proper height to more'convenieirtly perform the necessary work.

While We have shown, in accordance with the patent statutes, the principles of construction and operation of our hoisting attachment for tubular steel scaifolds'; and while we have endeavored to set forth the preferred embodiment of our invention, we desire to have it understood that this is illustrative of a means of achievement and that obvious changes may be made within the scope of the following claimswitliout departing from the spirit of our invention.

We claim:

1. For use in combination with a scaffold ofthe type having opposed sides and including vertically spaced horizontal rails, a readily detachable hoist comprising a pair of vertical guides, clamp means carried by said guides for attachment to scaffold side rails on inner opposed faces of a pair of opposed scaffold sides, a platform guidingly engaged with and between said guides, and a winch having clamp means for securexnen't to a side rail of a scaffold side on an exterior face thereof, lines connected to and extending between said winch and said platform, line guide means carried by the upper ends of said guides, said lines being'entrainedover said guide means.

2. For use in combination with a scaffold of the type having opposed sides and including vertically spaced horizontal rails, a readily detachable hoist comprising a pair of vertical guides, clamp means carried by said guides for attachment to scaffold side rails on inner opposed faces of a pair of opposed scaffold sides, a platform guidingly engaged with and between said' guides, and a winch having clamp means for securement to a side rail of a scaffold side on an exterior face thereof, lines connected to and extending between said winch and said platform, line guide means carried by the upper and lower ends of said guides, said lines being entrained over said line guide means. I

3. For use in combination with a scafiold of the type having opposed sides and including vertically spaced horizontal rails, a readily detachable hoist comprising a pair of vertical guides, clamp means carried by said guides ,for attachment to. scaffold side rails on inner opposed faces of a pair 'of opposed scaifold sides, a platform guidinglyengaged with and between said guides, and a winch having clamp. means for securement to a side rail of a scaffold side on an exterior face thereof, lines connected to and extending between said Winch and said platform, line guide means carried by the upper and lower ends of saidguides, said lines being entrained over said line guide means, one of said lines extending over both of said lower line guide means and one of said top line guide means, a second of said lines being entrained over one only of said top line guide means.

4. For use in combination with a scaffold of the type having opposed sides and including vertically spaced horizontal rails, a readily detachable hoist comprising a pair of vertical guides, clamp means carried by said guides for attachment to scaffold side rails on inner opposed faces of a pair of opposed scaffold sides, a platform guidingly engaged with and between said guides, and a winch having clamp means for securement to a side rail of a scaffold side on an exterior face thereof, lines connected to and extending between said winch and said platform, line guide assemblies including line guide means carried at the lower ends of said vertical guides, a spreader for extending between and secured to said line guide assemblies.

5. For use in combination with a scaffold of the type having opposed sides and including vertically spaced horizontal rails, a readily detachable hoist comprising a pair of vertical guides, clamp means carried by said guides for attachment to scaffold side rails ori inner opposed faces of a pair of opposed scaffold sides, a platfofrn guidingly engaged with and between said guides, and a winch having clamp means for securement to a side rail of a scaffold side on an exterior face thereof, lines connected to and extending between said winch and said platform, each of said clamp means including a backing plate engageable with a sca'ffold rail, a clamp bolt hingedly carried by said backing plate engag able-over a scatfoldrail, and adjustable fasteners carried by said clamp bolt for adiustably positioning said clainip bolt relative to said backing plate. k I

6. For use in combination with a scaffold of the type having opposed sides and including vertically'spaced'hori zontal rails, a readily detachable hoist comprising a pair of vertical guides, clamp means carried by saidg'uides for attachment to scaffold side rails oii'iiiner opposed faces of a pair of opposed scaffold sides, a platform guidingly engaged with and between said guides, a winch having clamp means for securern'ent to a side rail of a scaffold side on an exterior face thereof, lines connected to and extending between said which and said platform, line guide means carried by the upper and lower ends of said guides, said line's being entrained over said line guide means, one of said linesextending over both of said lower line guide means and one of said top line guide means, a second of said lines being entrained over one only of said top line guide means, each of said clamp means including a backing plate engageable with a scaffold rail, a clamp bolt hingedly"car ried by said backing plate engageable over a scaffold rail, and adjustable fasteners carried by said cramp-ban for aa u'seny positioning said clamp bolt relative to said backingplate'.

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